## rand(3UCB)

NAME
| SYNOPSIS
| DESCRIPTION
| SEE ALSO
| NOTES

#### NAME

rand, srand– simple random number generator

#### SYNOPSIS

`/usr/ucb/cc`[ `flag` ... ] `file` ...
int **rand()**

unsigned `seed`;

int srand(

`seed`);

#### DESCRIPTION

**rand()** uses a multiplicative congruential random number generator with period 2^{32} to return successive pseudo-random numbers in the range from 0 to "2^{31} - 1."

**srand()** can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a value of 1.

#### SEE ALSO

#### NOTES

Use of these interfaces should be restricted to only applications written on BSD platforms. Use of these interfaces with any of the system libraries or in multi-thread applications is unsupported.

The spectral properties of **rand()** leave a great deal to be desired. drand48(3C) and random(3C) provide
much better, though more elaborate, random-number generators.

The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1.

SunOS 5.9 Last Revised 12 Feb 1993

NAME
| SYNOPSIS
| DESCRIPTION
| SEE ALSO
| NOTES